The term for the body’s ability to resist disease is immunity. Immunity involves a complex network of biological systems, including the immune system, which defends the body against pathogens like bacteria and viruses. There are two primary types of immunity: innate immunity, which is the first line of defense and responds quickly to pathogens, and adaptive immunity, which develops more slowly but provides long-lasting protection through memory cells. A strong immune system is crucial for maintaining health and preventing illnesses.